Abstract
This study was conducted to evaluate the physiological indices in relation to screening of rapeseed genotypes for drought tolerance, and to study seed yield and seed yield components under early and late season drought stress. Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages. The experiments were conducted in East Azarbaijan Agricultural and Natural Resources Research and Education Center, Iran for 2 years (2010-2011 and 2012-2013). According to the results, canopy temperature (Tc) was increased, stomatal conductance (Kl) and relative water content (RWC) were decreased significantly by drought stress during the rosette and seed filling stages. Correlations among the aforementioned physiological traits at seed filling stage with each other and with seed yield were significant. It seems that these physiological traits can reflect the drought effects in rapeseed genotypes. Among the genotypes, significant differences were observed for Kl at seed filling and RWC at rosette stages. While, Okapi and Licord having the highest seed yield, presented the highest Kl during seed filling and RWC at rosette stages. Therefore, Tc, Kl and RWC can be used to screen rapeseed genotypes for tolerance to drought stress. Drought stress during the seed filling stage significantly decreased plant height, the number of siliques per plant, 1,000-seeds weight and seed yield. Results of path analysis indicated that plant height and yield components indicated positive direct effect on seed yield. Plant height had the highest direct effects on seed yield. Among the genotypes, Okapi and Licord were more suitable for cultivation in normal and drought conditions.
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Claims 13
Claim · model-written summary
Drought stress increased canopy temperature of rapeseed during the rosette and seed filling stages.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e1“canopy temperature (Tc) was increased, stomatal conductance (Kl) and relative water content (RWC) were decreased significantly by drought stress during the rosette and seed filling stages”
Claim · model-written summary
Drought stress decreased stomatal conductance of rapeseed significantly during the rosette and seed filling stages.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e1“canopy temperature (Tc) was increased, stomatal conductance (Kl) and relative water content (RWC) were decreased significantly by drought stress during the rosette and seed filling stages”
Claim · model-written summary
Drought stress decreased relative water content of rapeseed significantly during the rosette and seed filling stages.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e1“canopy temperature (Tc) was increased, stomatal conductance (Kl) and relative water content (RWC) were decreased significantly by drought stress during the rosette and seed filling stages”
Claim · model-written summary
Physiological traits at seed filling were significantly correlated with each other and with seed yield in rapeseed.
Not reportedDirection
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e2“Correlations among the aforementioned physiological traits at seed filling stage with each other and with seed yield were significant”
Claim · model-written summary
Canopy temperature, stomatal conductance and relative water content can be used to screen rapeseed genotypes for drought tolerance.
Verbatim
e3“Therefore, Tc, Kl and RWC can be used to screen rapeseed genotypes for tolerance to drought stress”
Claim · model-written summary
Okapi and Licord had the highest seed yield among the rapeseed genotypes.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e4“While, Okapi and Licord having the highest seed yield, presented the highest Kl during seed filling and RWC at rosette stages”
Claim · model-written summary
Okapi and Licord had the highest stomatal conductance (Kl) during seed filling among the rapeseed genotypes.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e4“While, Okapi and Licord having the highest seed yield, presented the highest Kl during seed filling and RWC at rosette stages”
Claim · model-written summary
Rapeseed genotypes differed significantly in stomatal conductance (Kl) at seed filling and relative water content (RWC) at rosette stage.
Not reportedDirection
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e5“Among the genotypes, significant differences were observed for Kl at seed filling and RWC at rosette stages”
Claim · model-written summary
Drought stress during seed filling significantly decreased plant height, number of siliques per plant and 1,000-seed weight of rapeseed.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e6“Drought stress during the seed filling stage significantly decreased plant height, the number of siliques per plant, 1,000-seeds weight and seed yield”
Claim · model-written summary
Drought stress during seed filling significantly decreased seed yield of rapeseed.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e6“Drought stress during the seed filling stage significantly decreased plant height, the number of siliques per plant, 1,000-seeds weight and seed yield”
Claim · model-written summary
Plant height and yield components had a positive direct effect on seed yield in path analysis.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e7“Results of path analysis indicated that plant height and yield components indicated positive direct effect on seed yield”
Claim · model-written summary
Plant height had the highest direct effect on seed yield in path analysis.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e6“Plant height had the highest direct effects on seed yield”
Claim · model-written summary
Okapi and Licord were more suitable for rapeseed cultivation under normal and drought conditions.
Verbatim
e0“Six rapeseed genotypes were evaluated under non-stressed and water deficit conditions during rosette and seed filling stages”
e1“Among the genotypes, Okapi and Licord were more suitable for cultivation in normal and drought conditions”
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